MMSE receivers for multirate DS-CDMA systems

Ashutosh Sabharwal; Urbashi Mitra; Randolph Moses

doi:10.1109/26.974265

MMSE receivers for multirate DS-CDMA systems

Ashutosh Sabharwal, Urbashi Mitra, Randolph Moses

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

Minimum-mean squared error (MMSE) receivers are designed and analyzed for multiple data rate direct-sequence code-division multiple-access (DS-CDMA) systems. The inherent cyclostationarity of the DS-CDMA signal is exploited to construct receivers for asynchronous multipath channels. Multiple- and single-bandwidth access are treated for both single and multicarrier scenarios. In general, the optimal receiver is periodically time-varying. When the period of the optimal receiver is large, suboptimal receivers are proposed to achieve a lower complexity implementation; the receivers are designed as a function of the cyclic statistics of the signals. In multiple chipping rate systems, complexity of receivers for smaller bandwidth users can also be controlled by changing their front-end filter bandwidth. The effect of front-end filter bandwidth on receiver performance and system capacity is quantified for a variable chipping rate system. Analysis and simulation show that significant performance gains are realized by the periodically time-varying MMSE receivers over their time-invariant counterparts.

Original language	English (US)
Pages (from-to)	2184-2197
Number of pages	14
Journal	IEEE Transactions on Communications
Volume	49
Issue number	12
DOIs	https://doi.org/10.1109/26.974265
State	Published - Dec 2001

Keywords

Asynchronous DS-CDMA
Cyclostationarity
MMSE receivers
Multicarrier systems
Multimedia systems
Multipath channels
Multiple data rate

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1109/26.974265

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title = "MMSE receivers for multirate DS-CDMA systems",

abstract = "Minimum-mean squared error (MMSE) receivers are designed and analyzed for multiple data rate direct-sequence code-division multiple-access (DS-CDMA) systems. The inherent cyclostationarity of the DS-CDMA signal is exploited to construct receivers for asynchronous multipath channels. Multiple- and single-bandwidth access are treated for both single and multicarrier scenarios. In general, the optimal receiver is periodically time-varying. When the period of the optimal receiver is large, suboptimal receivers are proposed to achieve a lower complexity implementation; the receivers are designed as a function of the cyclic statistics of the signals. In multiple chipping rate systems, complexity of receivers for smaller bandwidth users can also be controlled by changing their front-end filter bandwidth. The effect of front-end filter bandwidth on receiver performance and system capacity is quantified for a variable chipping rate system. Analysis and simulation show that significant performance gains are realized by the periodically time-varying MMSE receivers over their time-invariant counterparts.",

keywords = "Asynchronous DS-CDMA, Cyclostationarity, MMSE receivers, Multicarrier systems, Multimedia systems, Multipath channels, Multiple data rate",

author = "Ashutosh Sabharwal and Urbashi Mitra and Randolph Moses",

note = "Funding Information: Paper approved for publication by G. Caire, the Editor for Multiuser Detection and CDMA of the IEEE Communications Society. Manuscript received March 15, 2000; revised May 15, 2001. This work was supported in part by an Ameritech Dissertation Fellowship and in part by the National Science Foundation under CAREER Grant NCR 96-24375. This paper was presented in part at the 34th Annual Conference on Information Sciences and Systems, Princeton, NJ, March 2000, and at the IEEE Wireless Communications and Networking Conference, New Orleans, LA, September 1999.",

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N2 - Minimum-mean squared error (MMSE) receivers are designed and analyzed for multiple data rate direct-sequence code-division multiple-access (DS-CDMA) systems. The inherent cyclostationarity of the DS-CDMA signal is exploited to construct receivers for asynchronous multipath channels. Multiple- and single-bandwidth access are treated for both single and multicarrier scenarios. In general, the optimal receiver is periodically time-varying. When the period of the optimal receiver is large, suboptimal receivers are proposed to achieve a lower complexity implementation; the receivers are designed as a function of the cyclic statistics of the signals. In multiple chipping rate systems, complexity of receivers for smaller bandwidth users can also be controlled by changing their front-end filter bandwidth. The effect of front-end filter bandwidth on receiver performance and system capacity is quantified for a variable chipping rate system. Analysis and simulation show that significant performance gains are realized by the periodically time-varying MMSE receivers over their time-invariant counterparts.

AB - Minimum-mean squared error (MMSE) receivers are designed and analyzed for multiple data rate direct-sequence code-division multiple-access (DS-CDMA) systems. The inherent cyclostationarity of the DS-CDMA signal is exploited to construct receivers for asynchronous multipath channels. Multiple- and single-bandwidth access are treated for both single and multicarrier scenarios. In general, the optimal receiver is periodically time-varying. When the period of the optimal receiver is large, suboptimal receivers are proposed to achieve a lower complexity implementation; the receivers are designed as a function of the cyclic statistics of the signals. In multiple chipping rate systems, complexity of receivers for smaller bandwidth users can also be controlled by changing their front-end filter bandwidth. The effect of front-end filter bandwidth on receiver performance and system capacity is quantified for a variable chipping rate system. Analysis and simulation show that significant performance gains are realized by the periodically time-varying MMSE receivers over their time-invariant counterparts.

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KW - Multimedia systems

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KW - Multiple data rate

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MMSE receivers for multirate DS-CDMA systems

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